PAC

Mutex/CondVar/Thread/WQueue CPP classes for scheduler * test/cppunit_property.cc: work in progress test cases (Refs #157) * src/scheduler/thread.*: Thread CPP class (Refs #162) * src/scheduler/mutex.*: Mutex CPP class (Refs #162) * src/scheduler/condvar.*: Conditionalvariable CPP Class (Refs #162) * src/scheduler/wqueue.inl: Work pool (Refs #162) * test/cppunit_mutex: Unit test for mutex class (Refs #163) * test/cppunit_condvar: Unit test for condvar class (Refs #163) * test/cppunit_thread: Unit test for thread class (Refs #163) * test/cppunit_wqueue: Unit test for working queue class (Refs #163)